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Titolo:
Provenance of geogenic arsenic in the Goose River basin, Maine, USA
Autore:
Sidle, WC; Wotten, B; Murphy, E;
Indirizzi:
US EPA, NRMRL, Isotope & Hydrol Lab, Ctr Hill Facil, Cincinnati, OH 45224 USA US EPA Cincinnati OH USA 45224 , Ctr Hill Facil, Cincinnati, OH 45224 USA Groundwater Res Co, Waldoboro, ME 04572 USA Groundwater Res Co Waldoboro ME USA 04572 Res Co, Waldoboro, ME 04572 USA Medomak Valley Land Trust, Atlantic Ctr Environm, Waldoboro, ME 04572 USA Medomak Valley Land Trust Waldoboro ME USA 04572 Waldoboro, ME 04572 USA
Titolo Testata:
ENVIRONMENTAL GEOLOGY
fascicolo: 1-2, volume: 41, anno: 2001,
pagine: 62 - 73
SICI:
0943-0105(200111)41:1-2<62:POGAIT>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
WALDOBORO PLUTON COMPLEX; SULFATE; GROUNDWATER; SULFUR; WATER; EXCHANGE; DELTA-O-18; SPECIATION; OXIDATION; ISOTOPES;
Keywords:
arsenic; Maine; pyrite; sulfate; sulfur isotope;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Sidle, WC US EPA, NRMRL, Isotope & Hydrol Lab, Ctr Hill Facil, 5995 Ctr Hill Ave, Cincinnati, OH 45224 USA US EPA 5995 Ctr Hill Ave Cincinnati OH USA45224 i, OH 45224 USA
Citazione:
W.C. Sidle et al., "Provenance of geogenic arsenic in the Goose River basin, Maine, USA", ENVIR GEOL, 41(1-2), 2001, pp. 62-73

Abstract

Occurrences of arsenic (As) are sporadic in drinking water from many wellsin mid-coastal Maine. This is particularly the case where water supplies are pumped from fractured igneous and metamorphic bedrock. Although health risk-based As contamination levels are lowered, it is likely that the provenance of trace As concentrations will need to be scrutinized. Approximately 33% of wells sampled in the Goose River ground-watershed had at least one occurrence of 10 mug l(-1) As. Geologic mapping in combination with the rockpetrology and mineral chemistry were important in deciphering probable local source areas for arsenic. Median whole rock As is greater than 39 mg kg(-1) in the Bucksport Formation and anatectic granitoids of the Waldoboro Pluton Complex. S-34 isotopic composition of arsenian pyrites indicate that local areas of anomalous arsenic-bearing, transported soils are not the source of trace As in groundwater, but, instead, the As is derived from oxidation processes in the fractured bedrock along the western margin of the ground-watershed. In groundwater, the As3+/As5+ ratios ranged from 0.01 to 4.45 and were inconsistent spatially and temporally. Although it is probable that the stability field in most groundwater supplies is HAsO42-, arsenic speciation is not necessarily an aid to predicting transport. Instead an isotopic evaluation of associated groundwater SO42- clearly indicates a consistent correlation of elevated As with enriched delta S-34(SO4). The delta S-34(SO4) ranges of +4.05 to +4.61 parts per thousand may be characteristic of local oxidation in the fractured groundwater flow systems. Potential areas of geogenic As transport may be predictable.

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Documento generato il 02/07/20 alle ore 22:23:24